public byte[] TransformFinalBlock(byte[] inputBuffer, int inputOffset, int inputCount)
{
// inputCount != InputBlockSize is allowed
ThrowHelper.ValidateTransformBlock(inputBuffer, inputOffset, inputCount);
if (_inputBuffer == null)
{
ThrowHelper.ThrowObjectDisposed();
}
if (inputCount == 0)
{
return(Array.Empty <byte>());
}
// The common case is inputCount <= Base64InputBlockSize
byte[]? tmpBufferArray = null;
Span <byte> tmpBuffer = stackalloc byte[StackAllocSize];
if (inputCount > StackAllocSize)
{
tmpBuffer = tmpBufferArray = CryptoPool.Rent(inputCount);
}
tmpBuffer = GetTempBuffer(inputBuffer.AsSpan(inputOffset, inputCount), tmpBuffer);
int bytesToTransform = _inputIndex + tmpBuffer.Length;
// Too little data to decode
if (bytesToTransform < InputBlockSize)
{
// reinitialize the transform
Reset();
ReturnToCryptoPool(tmpBufferArray, tmpBuffer.Length);
return(Array.Empty <byte>());
}
int outputSize = GetOutputSize(bytesToTransform, tmpBuffer);
byte[] output = new byte[outputSize];
ConvertFromBase64(tmpBuffer, output, out int consumed, out int written);
Debug.Assert(written == outputSize);
ReturnToCryptoPool(tmpBufferArray, tmpBuffer.Length);
// reinitialize the transform
Reset();
return(output);
}
public int TransformBlock(byte[] inputBuffer, int inputOffset, int inputCount, byte[] outputBuffer, int outputOffset)
{
// inputCount != InputBlockSize is allowed
ThrowHelper.ValidateTransformBlock(inputBuffer, inputOffset, inputCount);
if (_inputBuffer == null)
{
ThrowHelper.ThrowObjectDisposed();
}
if (outputBuffer == null)
{
ThrowHelper.ThrowArgumentNull(ThrowHelper.ExceptionArgument.outputBuffer);
}
// The common case is inputCount = InputBlockSize
byte[]? tmpBufferArray = null;
Span <byte> tmpBuffer = stackalloc byte[StackAllocSize];
if (inputCount > StackAllocSize)
{
tmpBuffer = tmpBufferArray = CryptoPool.Rent(inputCount);
}
tmpBuffer = GetTempBuffer(inputBuffer.AsSpan(inputOffset, inputCount), tmpBuffer);
int bytesToTransform = _inputIndex + tmpBuffer.Length;
// Too little data to decode: save data to _inputBuffer, so it can be transformed later
if (bytesToTransform < InputBlockSize)
{
tmpBuffer.CopyTo(_inputBuffer.AsSpan(_inputIndex));
_inputIndex = bytesToTransform;
ReturnToCryptoPool(tmpBufferArray, tmpBuffer.Length);
return(0);
}
ConvertFromBase64(tmpBuffer, outputBuffer.AsSpan(outputOffset), out _, out int written);
ReturnToCryptoPool(tmpBufferArray, tmpBuffer.Length);
return(written);
}
